Broadening of the spectral lines by resonance and Van der Waals forces in the Schumann-Runge system of O₂, the first and second positive systems of N₂, the beta and gamma systems of NO and the first negative system of N₂⁺ is treated by means of the impact approximation. At temperatures of 1000°K and higher, the broadening effect of the resonance forces is negligible; there is hence no J dependence in the widths. Van der Waals constants are calculated for the electronic-vibrational levels of interest using available discrete and continuous oscillator strengths. Half-widths in the various systems have been computed for 0 ⋜ ν, ν′ ⋜ 12, 1000°K T 18,000°K and ρ/ρ₀ = 10,10^-1. In general, there is not much width variation with vibrational band in a system.

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